No one attacked the ARCH network and it is not a security risk to stake your coins. Leaving any unencrypted wallet file on your computer is idiotic, if you lost your coins it is your own fault.
I have been staking my coins for over 6 months and my balance only goes up. Do you know why? My wallet is encrypted.
What is the relevance of those wallets that you linked? If they have 32,000 coins they can probably access CEO info.
Thirdly you are justify theft of property is OK because if you are able to steal it it means the owner did not secure it well enough so therefore it is fair game.
If you car was stolen off the street would you call the dealership or the cops?
The people who steal coins are looking for ALL coins. They didn't target the Arch network, they targeted YOU and were able to steal ANY wallet.dat file regardless of it staking. Without encryption, all they need to do is scan for all .dat files, copy them and import it into their own wallet.
It sucks that you lost your coins but there is nothing Arch can or should do.